Missed period, swollen tender breast, dryness in vagina, constipation, nausea, weight gain, smell sensitivity. those are my symptoms please help me.

Maybe not preg.: Pregnancy is a common cause of a missed period. If not pregnant, other causes of a late or missed period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (especially birth control pills), hormonal disorders, etc… If worried, one can do a home urine pregnancy test 3 weeks after sex. One's doctor can help evaluate.